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    五大常用算法之四：回溯法
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          五大常用算法之四：回溯法
         </a>
        </h1>
        <address class="msccaddress ">
         <em>
          2,272 次阅读 -
         </em>
         <a href="http://dataunion.org/category/tech" rel="category tag">
          文章
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       <p>
        作者：
        <a href="http://www.cnblogs.com/steven_oyj/archive/2010/05/22/1741376.html" target="_blank">
         红脸书生
        </a>
       </p>
       <div id="art">
        <h1>
         1、概念
        </h1>
        <p>
         <span class="Apple-style-span">
          回溯算法实际上一个类似枚举的搜索尝试过程，主要是在搜索尝试过程中寻找问题的解，当发现已不满足求解条件时，就“回溯”返回，尝试别的路径。
         </span>
        </p>
        <p>
         <span class="Apple-style-span">
          回溯法是一种选优搜索法，按选优条件向前搜索，以达到目标。但当探索到某一步时，发现原先选择并不优或达不到目标，就退回一步重新选择，这种走不通就退回再走的技术为回溯法，而满足回溯条件的某个状态的点称为“回溯点”。
         </span>
        </p>
        <p>
         <span class="Apple-style-span">
          许多复杂的，规模较大的问题都可以使用回溯法，有“通用解题方法”的美称。
         </span>
        </p>
        <h1>
         2、基本思想
        </h1>
        <p>
         <span class="Apple-style-span">
          <b>
          </b>
          在包含问题的所有解的解空间树中，按照
          <strong>
           深度优先搜索的策略
          </strong>
          ，从根结点出发深度探索解空间树。当探索到某一结点时，要先判断该结点是否包含问题的解，如果包含，就从该结点出发继续探索下去，如果该结点不包含问题的解，则逐层向其祖先结点回溯。（其实回溯法就是对隐式图的深度优先搜索算法）。
         </span>
        </p>
        <p>
         <span class="Apple-style-span">
          若用回溯法求问题的所有解时，要回溯到根，且根结点的所有可行的子树都要已被搜索遍才结束。
         </span>
        </p>
        <p>
         <span class="Apple-style-span">
          而若使用回溯法求任一个解时，只要搜索到问题的一个解就可以结束。
         </span>
        </p>
        <h1>
         3、用回溯法解题的一般步骤：
        </h1>
        <p>
         <span class="Apple-style-span">
          （1）针对所给问题，确定问题的解空间：
         </span>
        </p>
        <p>
         <span class="Apple-style-span">
          首先应明确定义问题的解空间，问题的解空间应至少包含问题的一个（最优）解。
         </span>
        </p>
        <p>
         <span class="Apple-style-span">
          （2）确定结点的扩展搜索规则
         </span>
        </p>
        <p>
         <span class="Apple-style-span">
          （3）以深度优先方式搜索解空间，并在搜索过程中用剪枝函数避免无效搜索。
         </span>
        </p>
        <h1>
         4、算法框架
        </h1>
        <p>
         <span class="Apple-style-span">
          （1）问题框架
         </span>
        </p>
        <p>
         <span class="Apple-style-span">
          设问题的解是一个n维向量(a1,a2,………,an),约束条件是ai(i=1,2,3,…..,n)之间满足某种条件，记为f(ai)。
         </span>
        </p>
        <p>
         <span class="Apple-style-span">
          （2）非递归回溯框架
         </span>
        </p>
        <div id="codeSnippetWrapper">
         <div id="codeSnippet">
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             &lt;span id="lnum1"&gt;   1:&lt;/span&gt; int a[n],i;
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             &lt;span id="lnum2"&gt;   2:&lt;/span&gt; 初始化数组a[];
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                  <span class="crayon-h">
                  </span>
                  初始化数组
                  <span class="crayon-v">
                   a
                  </span>
                  <span class="crayon-sy">
                   [
                  </span>
                  <span class="crayon-sy">
                   ]
                  </span>
                  <span class="crayon-sy">
                   ;
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0010 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39baa809723890" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum3"&gt;   3:&lt;/span&gt; i = 1;
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39baa809723890-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39baa809723890-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum3"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   3
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-v">
                   i
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   1
                  </span>
                  <span class="crayon-sy">
                   ;
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0010 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bb0853933409" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum4"&gt;   4:&lt;/span&gt; while (i&amp;gt;0(有路可走)   and  (未达到目标))  // 还未回溯到头
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bb0853933409-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bb0853933409-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum4"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   4
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-st">
                   while
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   (
                  </span>
                  <span class="crayon-v">
                   i
                  </span>
                  <span class="crayon-o">
                   &amp;
                  </span>
                  <span class="crayon-v">
                   gt
                  </span>
                  <span class="crayon-sy">
                   ;
                  </span>
                  <span class="crayon-cn">
                   0
                  </span>
                  <span class="crayon-sy">
                   (
                  </span>
                  有路可走
                  <span class="crayon-sy">
                   )
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-st">
                   and
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   (
                  </span>
                  未达到目标
                  <span class="crayon-sy">
                   )
                  </span>
                  <span class="crayon-sy">
                   )
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-c">
                   // 还未回溯到头
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0108 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bb6736127146" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum5"&gt;   5:&lt;/span&gt; {
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bb6736127146-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bb6736127146-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum5"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   5
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   {
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0009 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bbc738733099" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum6"&gt;   6:&lt;/span&gt;     if(i &amp;gt; n)                                              // 搜索到叶结点
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bbc738733099-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bbc738733099-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum6"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   6
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-st">
                   if
                  </span>
                  <span class="crayon-sy">
                   (
                  </span>
                  <span class="crayon-v">
                   i
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-o">
                   &amp;
                  </span>
                  <span class="crayon-v">
                   gt
                  </span>
                  <span class="crayon-sy">
                   ;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-v">
                   n
                  </span>
                  <span class="crayon-sy">
                   )
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-c">
                   // 搜索到叶结点
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0014 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bc2318184353" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum7"&gt;   7:&lt;/span&gt;     {
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bc2318184353-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bc2318184353-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum7"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   7
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   {
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0010 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bc7758197046" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum8"&gt;   8:&lt;/span&gt;           搜索到一个解，输出；
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bc7758197046-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bc7758197046-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum8"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   8
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  搜索到一个解，输出；
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0009 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bcd151429113" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum9"&gt;   9:&lt;/span&gt;     }
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bcd151429113-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bcd151429113-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum9"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   9
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   }
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0008 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bd3871951966" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum10"&gt;  10:&lt;/span&gt;     else                                                   // 处理第i个元素
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bd3871951966-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bd3871951966-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum10"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   10
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-st">
                   else
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-c">
                   // 处理第i个元素
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0009 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bd8747797848" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum11"&gt;  11:&lt;/span&gt;     {
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bd8747797848-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bd8747797848-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum11"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   11
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   {
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0009 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bdd499863183" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum12"&gt;  12:&lt;/span&gt;           a[i]第一个可能的值；
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bdd499863183-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bdd499863183-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum12"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   12
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-v">
                   a
                  </span>
                  <span class="crayon-sy">
                   [
                  </span>
                  <span class="crayon-v">
                   i
                  </span>
                  <span class="crayon-sy">
                   ]
                  </span>
                  第一个可能的值；
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0009 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39be3234079544" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum13"&gt;  13:&lt;/span&gt;           while(a[i]在不满足约束条件且在搜索空间内)
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39be3234079544-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39be3234079544-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum13"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   13
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-st">
                   while
                  </span>
                  <span class="crayon-sy">
                   (
                  </span>
                  <span class="crayon-v">
                   a
                  </span>
                  <span class="crayon-sy">
                   [
                  </span>
                  <span class="crayon-v">
                   i
                  </span>
                  <span class="crayon-sy">
                   ]
                  </span>
                  在不满足约束条件且在搜索空间内
                  <span class="crayon-sy">
                   )
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0011 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39be9682534981" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum14"&gt;  14:&lt;/span&gt;           {
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39be9682534981-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39be9682534981-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum14"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   14
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   {
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0008 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bee652210200" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum15"&gt;  15:&lt;/span&gt;               a[i]下一个可能的值；
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bee652210200-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bee652210200-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum15"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   15
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-v">
                   a
                  </span>
                  <span class="crayon-sy">
                   [
                  </span>
                  <span class="crayon-v">
                   i
                  </span>
                  <span class="crayon-sy">
                   ]
                  </span>
                  下一个可能的值；
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0015 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bf4125689050" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum16"&gt;  16:&lt;/span&gt;           }
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bf4125689050-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bf4125689050-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum16"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   16
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   }
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0009 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bfa313881006" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum17"&gt;  17:&lt;/span&gt;           if(a[i]在搜索空间内)
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bfa313881006-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bfa313881006-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum17"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   17
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-st">
                   if
                  </span>
                  <span class="crayon-sy">
                   (
                  </span>
                  <span class="crayon-v">
                   a
                  </span>
                  <span class="crayon-sy">
                   [
                  </span>
                  <span class="crayon-v">
                   i
                  </span>
                  <span class="crayon-sy">
                   ]
                  </span>
                  在搜索空间内
                  <span class="crayon-sy">
                   )
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0011 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39bff595294207" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum18"&gt;  18:&lt;/span&gt;          {
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39bff595294207-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39bff595294207-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum18"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   18
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   {
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0010 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c05341109855" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum19"&gt;  19:&lt;/span&gt;               标识占用的资源；
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39c05341109855-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39c05341109855-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum19"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   19
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  标识占用的资源；
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0009 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c0a391059538" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum20"&gt;  20:&lt;/span&gt;               i = i+1;                              // 扩展下一个结点
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39c0a391059538-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39c0a391059538-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum20"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   20
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-v">
                   i
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-v">
                   i
                  </span>
                  <span class="crayon-o">
                   +
                  </span>
                  <span class="crayon-cn">
                   1
                  </span>
                  <span class="crayon-sy">
                   ;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-c">
                   // 扩展下一个结点
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0012 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c10486740233" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum21"&gt;  21:&lt;/span&gt;          }
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39c10486740233-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39c10486740233-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum21"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   21
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   }
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0008 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c15237896539" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum22"&gt;  22:&lt;/span&gt;          else
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39c15237896539-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39c15237896539-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum22"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   22
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-st">
                   else
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0008 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c1b891344071" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum23"&gt;  23:&lt;/span&gt;         {
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39c1b891344071-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39c1b891344071-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum23"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   23
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   {
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0009 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c20668964776" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
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             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
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             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum24"&gt;  24:&lt;/span&gt;               清理所占的状态空间；            // 回溯
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39c20668964776-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39c20668964776-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum24"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   24
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  清理所占的状态空间；
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-c">
                   // 回溯
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0010 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c26376066191" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum25"&gt;  25:&lt;/span&gt;               i = i –1;
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39c26376066191-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39c26376066191-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum25"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   25
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-v">
                   i
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-i">
                   i
                  </span>
                  <span class="crayon-h">
                  </span>
                  –
                  <span class="crayon-cn">
                   1
                  </span>
                  <span class="crayon-sy">
                   ;
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0011 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c2b077208916" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum26"&gt;  26:&lt;/span&gt;          }
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39c2b077208916-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39c2b077208916-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum26"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   26
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   }
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0008 seconds] -->
          <br/>
          <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
          <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c31992989420" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
           <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <span class="crayon-title">
            </span>
            <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
             <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-wrap-button" title="切换自动换行">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-expand-button" title="点击展开代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-copy-button" title="复制代码">
              <div class="crayon-button-icon">
              </div>
             </div>
             <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
              <div class="crayon-button-icon">
              </div>
             </div>
            </div>
           </div>
           <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
           </div>
           <div class="crayon-plain-wrap">
            <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
             &lt;span id="lnum27"&gt;  27:&lt;/span&gt; }
            </textarea>
           </div>
           <div class="crayon-main" style="">
            <table class="crayon-table">
             <tbody>
              <tr class="crayon-row">
               <td class="crayon-nums " data-settings="show">
                <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                 <div class="crayon-num" data-line="crayon-57686cdd39c31992989420-1">
                  1
                 </div>
                </div>
               </td>
               <td class="crayon-code">
                <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                 <div class="crayon-line" id="crayon-57686cdd39c31992989420-1">
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-e">
                   span
                  </span>
                  <span class="crayon-v">
                   id
                  </span>
                  <span class="crayon-o">
                   =
                  </span>
                  <span class="crayon-s">
                   "lnum27"
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-cn">
                   27
                  </span>
                  <span class="crayon-o">
                   :
                  </span>
                  <span class="crayon-o">
                   &lt;
                  </span>
                  <span class="crayon-o">
                   /
                  </span>
                  <span class="crayon-v">
                   span
                  </span>
                  <span class="crayon-o">
                   &gt;
                  </span>
                  <span class="crayon-h">
                  </span>
                  <span class="crayon-sy">
                   }
                  </span>
                 </div>
                </div>
               </td>
              </tr>
             </tbody>
            </table>
           </div>
          </div>
          <!-- [Format Time: 0.0008 seconds] -->
         </div>
        </div>
       </div>
       <p>
        （3）递归的算法框架
       </p>
       <p>
        回溯法是对解空间的深度优先搜索，在一般情况下使用递归函数来实现回溯法比较简单，其中i为搜索的深度，框架如下：
       </p>
       <div id="codeSnippetWrapper">
        <div id="codeSnippet">
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c37562149874" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
           </div>
          </div>
          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum1"&gt;   1:&lt;/span&gt; int a[n];
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c37562149874-1">
                 1
                </div>
               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c37562149874-1">
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum1"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  1
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-v">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-t">
                  int
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-v">
                  a
                 </span>
                 <span class="crayon-sy">
                  [
                 </span>
                 <span class="crayon-v">
                  n
                 </span>
                 <span class="crayon-sy">
                  ]
                 </span>
                 <span class="crayon-sy">
                  ;
                 </span>
                </div>
               </div>
              </td>
             </tr>
            </tbody>
           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0010 seconds] -->
         <br/>
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c3c250189881" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
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            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
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             <div class="crayon-button-icon">
             </div>
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            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
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            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
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             <div class="crayon-button-icon">
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            &lt;span id="lnum2"&gt;   2:&lt;/span&gt; try(int i)
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          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c3c250189881-1">
                 1
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               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c3c250189881-1">
                 <span class="crayon-o">
                  &lt;
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                 <span class="crayon-e">
                  span
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                 <span class="crayon-v">
                  id
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                  =
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                 <span class="crayon-s">
                  "lnum2"
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                 <span class="crayon-o">
                  &gt;
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                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  2
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                 <span class="crayon-o">
                  :
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                 <span class="crayon-o">
                  &lt;
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                  /
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                 <span class="crayon-v">
                  span
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                 <span class="crayon-o">
                  &gt;
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                 </span>
                 <span class="crayon-st">
                  try
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                  (
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                 <span class="crayon-t">
                  int
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                 <span class="crayon-h">
                 </span>
                 <span class="crayon-v">
                  i
                 </span>
                 <span class="crayon-sy">
                  )
                 </span>
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              </td>
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           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
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            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
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             <div class="crayon-button-icon">
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            &lt;span id="lnum3"&gt;   3:&lt;/span&gt; {
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                 1
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              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c42451214792-1">
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                  &lt;
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                 <span class="crayon-e">
                  span
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                 <span class="crayon-v">
                  id
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                 <span class="crayon-o">
                  =
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                 <span class="crayon-s">
                  "lnum3"
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                  &gt;
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                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  3
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                  :
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                 <span class="crayon-o">
                  &lt;
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                  /
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                 <span class="crayon-e">
                  span
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                  &gt;
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                 </span>
                 <span class="crayon-sy">
                  {
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             </tr>
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          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
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            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
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             <div class="crayon-button-icon">
             </div>
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            <div class="crayon-button crayon-expand-button" title="点击展开代码">
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            &lt;span id="lnum4"&gt;   4:&lt;/span&gt;     if(i&amp;gt;n)
           </textarea>
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          <div class="crayon-main" style="">
           <table class="crayon-table">
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              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c47116484268-1">
                 1
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               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c47116484268-1">
                 <span class="crayon-o">
                  &lt;
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                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum4"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  4
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-v">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-st">
                  if
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                 <span class="crayon-sy">
                  (
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                 <span class="crayon-v">
                  i
                 </span>
                 <span class="crayon-o">
                  &amp;
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                 <span class="crayon-v">
                  gt
                 </span>
                 <span class="crayon-sy">
                  ;
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                 <span class="crayon-v">
                  n
                 </span>
                 <span class="crayon-sy">
                  )
                 </span>
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              </td>
             </tr>
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         <!-- [Format Time: 0.0011 seconds] -->
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         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
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          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
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           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
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            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
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            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
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            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
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           </div>
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          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
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           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum5"&gt;   5:&lt;/span&gt;        输出结果;
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          <div class="crayon-main" style="">
           <table class="crayon-table">
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              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c4d383261216-1">
                 1
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              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c4d383261216-1">
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                  span
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                 <span class="crayon-v">
                  id
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                  =
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                  "lnum5"
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                  &gt;
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                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  5
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                  :
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                 <span class="crayon-o">
                  &lt;
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                  /
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                 <span class="crayon-v">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
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                 <span class="crayon-h">
                 </span>
                 输出结果
                 <span class="crayon-sy">
                  ;
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              </td>
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         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
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          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
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           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
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          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
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           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum6"&gt;   6:&lt;/span&gt;      else
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          <div class="crayon-main" style="">
           <table class="crayon-table">
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              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
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                 1
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               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c52342674024-1">
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                  &lt;
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                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
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                 <span class="crayon-s">
                  "lnum6"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  6
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                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
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                 <span class="crayon-v">
                  span
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                 <span class="crayon-o">
                  &gt;
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                 <span class="crayon-h">
                 </span>
                 <span class="crayon-st">
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              </td>
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         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
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          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
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           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
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            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
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            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
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            <div class="crayon-button crayon-expand-button" title="点击展开代码">
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          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum7"&gt;   7:&lt;/span&gt;     {
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c58637640771-1">
                 1
                </div>
               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c58637640771-1">
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum7"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  7
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-sy">
                  {
                 </span>
                </div>
               </div>
              </td>
             </tr>
            </tbody>
           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0008 seconds] -->
         <br/>
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c5d409458374" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
           </div>
          </div>
          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum8"&gt;   8:&lt;/span&gt;        for(j = 下界; j &amp;lt;= 上界; j=j+1)  // 枚举i所有可能的路径
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c5d409458374-1">
                 1
                </div>
               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c5d409458374-1">
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum8"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  8
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-v">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-st">
                  for
                 </span>
                 <span class="crayon-sy">
                  (
                 </span>
                 <span class="crayon-v">
                  j
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-h">
                 </span>
                 下界
                 <span class="crayon-sy">
                  ;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-v">
                  j
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-o">
                  &amp;
                 </span>
                 <span class="crayon-v">
                  lt
                 </span>
                 <span class="crayon-sy">
                  ;
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-h">
                 </span>
                 上界
                 <span class="crayon-sy">
                  ;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-v">
                  j
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-v">
                  j
                 </span>
                 <span class="crayon-o">
                  +
                 </span>
                 <span class="crayon-cn">
                  1
                 </span>
                 <span class="crayon-sy">
                  )
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-c">
                  // 枚举i所有可能的路径
                 </span>
                </div>
               </div>
              </td>
             </tr>
            </tbody>
           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0017 seconds] -->
         <br/>
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c63576238033" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
           </div>
          </div>
          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum9"&gt;   9:&lt;/span&gt;        {
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c63576238033-1">
                 1
                </div>
               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c63576238033-1">
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum9"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  9
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-sy">
                  {
                 </span>
                </div>
               </div>
              </td>
             </tr>
            </tbody>
           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0008 seconds] -->
         <br/>
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c68552094020" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
           </div>
          </div>
          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum10"&gt;  10:&lt;/span&gt;            if(fun(j))                 // 满足限界函数和约束条件
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c68552094020-1">
                 1
                </div>
               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c68552094020-1">
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum10"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  10
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-v">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-st">
                  if
                 </span>
                 <span class="crayon-sy">
                  (
                 </span>
                 <span class="crayon-e">
                  fun
                 </span>
                 <span class="crayon-sy">
                  (
                 </span>
                 <span class="crayon-v">
                  j
                 </span>
                 <span class="crayon-sy">
                  )
                 </span>
                 <span class="crayon-sy">
                  )
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-c">
                  // 满足限界函数和约束条件
                 </span>
                </div>
               </div>
              </td>
             </tr>
            </tbody>
           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0012 seconds] -->
         <br/>
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c6e234068940" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
           </div>
          </div>
          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum11"&gt;  11:&lt;/span&gt;              {
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c6e234068940-1">
                 1
                </div>
               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c6e234068940-1">
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum11"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  11
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-sy">
                  {
                 </span>
                </div>
               </div>
              </td>
             </tr>
            </tbody>
           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0008 seconds] -->
         <br/>
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c73066004701" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
           </div>
          </div>
          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum12"&gt;  12:&lt;/span&gt;                 a[i] = j;
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c73066004701-1">
                 1
                </div>
               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c73066004701-1">
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum12"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  12
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-v">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-v">
                  a
                 </span>
                 <span class="crayon-sy">
                  [
                 </span>
                 <span class="crayon-v">
                  i
                 </span>
                 <span class="crayon-sy">
                  ]
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-v">
                  j
                 </span>
                 <span class="crayon-sy">
                  ;
                 </span>
                </div>
               </div>
              </td>
             </tr>
            </tbody>
           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0011 seconds] -->
         <br/>
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c79320548056" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
           </div>
          </div>
          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum13"&gt;  13:&lt;/span&gt;               ...                         // 其他操作
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c79320548056-1">
                 1
                </div>
               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c79320548056-1">
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum13"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  13
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-v">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-sy">
                  .
                 </span>
                 <span class="crayon-sy">
                  .
                 </span>
                 <span class="crayon-sy">
                  .
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-c">
                  // 其他操作
                 </span>
                </div>
               </div>
              </td>
             </tr>
            </tbody>
           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0010 seconds] -->
         <br/>
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c7e527780507" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
           </div>
          </div>
          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum14"&gt;  14:&lt;/span&gt;                 try(i+1);
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c7e527780507-1">
                 1
                </div>
               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c7e527780507-1">
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum14"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  14
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-v">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-st">
                  try
                 </span>
                 <span class="crayon-sy">
                  (
                 </span>
                 <span class="crayon-v">
                  i
                 </span>
                 <span class="crayon-o">
                  +
                 </span>
                 <span class="crayon-cn">
                  1
                 </span>
                 <span class="crayon-sy">
                  )
                 </span>
                 <span class="crayon-sy">
                  ;
                 </span>
                </div>
               </div>
              </td>
             </tr>
            </tbody>
           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0011 seconds] -->
         <br/>
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c83464159470" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
           </div>
          </div>
          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum15"&gt;  15:&lt;/span&gt;               回溯前的清理工作（如a[i]置空值等）;
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c83464159470-1">
                 1
                </div>
               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c83464159470-1">
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum15"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  15
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-v">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 回溯前的清理工作（如
                 <span class="crayon-v">
                  a
                 </span>
                 <span class="crayon-sy">
                  [
                 </span>
                 <span class="crayon-v">
                  i
                 </span>
                 <span class="crayon-sy">
                  ]
                 </span>
                 置空值等）
                 <span class="crayon-sy">
                  ;
                 </span>
                </div>
               </div>
              </td>
             </tr>
            </tbody>
           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0011 seconds] -->
         <br/>
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c89098918139" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
           </div>
          </div>
          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum16"&gt;  16:&lt;/span&gt;               }
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
               <div class="crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">
                <div class="crayon-num" data-line="crayon-57686cdd39c89098918139-1">
                 1
                </div>
               </div>
              </td>
              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
                <div class="crayon-line" id="crayon-57686cdd39c89098918139-1">
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-e">
                  span
                 </span>
                 <span class="crayon-v">
                  id
                 </span>
                 <span class="crayon-o">
                  =
                 </span>
                 <span class="crayon-s">
                  "lnum16"
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-cn">
                  16
                 </span>
                 <span class="crayon-o">
                  :
                 </span>
                 <span class="crayon-o">
                  &lt;
                 </span>
                 <span class="crayon-o">
                  /
                 </span>
                 <span class="crayon-v">
                  span
                 </span>
                 <span class="crayon-o">
                  &gt;
                 </span>
                 <span class="crayon-h">
                 </span>
                 <span class="crayon-sy">
                  }
                 </span>
                </div>
               </div>
              </td>
             </tr>
            </tbody>
           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0008 seconds] -->
         <br/>
         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
         <div class="crayon-syntax crayon-theme-classic crayon-font-monaco crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouseover" id="crayon-57686cdd39c8e318346124" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">
          <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
           <span class="crayon-title">
           </span>
           <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">
            <div class="crayon-button crayon-nums-button" title="切换是否显示行编号">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-plain-button" title="纯文本显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-wrap-button" title="切换自动换行">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-expand-button" title="点击展开代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-copy-button" title="复制代码">
             <div class="crayon-button-icon">
             </div>
            </div>
            <div class="crayon-button crayon-popup-button" title="在新窗口中显示代码">
             <div class="crayon-button-icon">
             </div>
            </div>
           </div>
          </div>
          <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">
          </div>
          <div class="crayon-plain-wrap">
           <textarea class="crayon-plain print-no" data-settings="dblclick" readonly="" style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;" wrap="soft">
            &lt;span id="lnum17"&gt;  17:&lt;/span&gt;          }
           </textarea>
          </div>
          <div class="crayon-main" style="">
           <table class="crayon-table">
            <tbody>
             <tr class="crayon-row">
              <td class="crayon-nums " data-settings="show">
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                 1
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                  }
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              </td>
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           </table>
          </div>
         </div>
         <!-- [Format Time: 0.0008 seconds] -->
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         <!-- Crayon Syntax Highlighter v_2.7.2_beta -->
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            &lt;span id="lnum18"&gt;  18:&lt;/span&gt;      }
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            &lt;span id="lnum19"&gt;  19:&lt;/span&gt; }
           </textarea>
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           <table class="crayon-table">
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                <div class="crayon-num" data-line="crayon-57686cdd39c99344736095-1">
                 1
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              <td class="crayon-code">
               <div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">
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                  "lnum19"
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                  &gt;
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                 </span>
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                  19
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                  :
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                  &lt;
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                 </span>
                 <span class="crayon-sy">
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       <p>
        文章出处：
        <a href="http://www.cnblogs.com/steven_oyj/archive/2010/05/22/1741376.html">
         http://www.cnblogs.com/steven_oyj/archive/2010/05/22/1741376.html
        </a>
       </p>
       <p>
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          广告算法研发经理-薪资开放-北京-国内顶级社会化营销公司
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         <a data-original-title="【数盟内推】机器学习算法工程师-10K~25K-成都/北京-A轮千万级大数据公司" href="http://dataunion.org/?p=6393" target="_blank" title="">
          机器学习算法工程师-10K~25K-成都/北京-A轮千万级大数据公司
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       </blockquote>
      </div>
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